The plural form of cooboo, referring to multiple instances of the Aboriginal object or concept.
From cooboo plus the regular English plural suffix -s, showing how Aboriginal terms were adapted into English plural forms when used by colonists.
The fact that English speakers pluralized Aboriginal words with standard English rules (adding -s) shows cultural dominance at work in language—Aboriginal languages had their own pluralization systems, but English-speakers just applied their own grammar, literally reshaping Indigenous concepts into English patterns.
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